Device for opening lids hinged to boxes



Oct. 3, 1944. Y GQORSTROM 5 DEVICE'FOR OPENING-LIBS HINGED TOVBOXES F iled Jan. 15, 1944 I 41Sheets-Sheet 1- v I W Oct. 3,- 1944.

G. ORSTROM DEVICE FOR OPENING LIDs HINGED TO BOXES Filed Jan; 15, 1944 4 SheetS-S heet 2 e. ORSTROM DEVICE FOR OPENING LIDS HINGED TO BOXES 7 Filed Jan. 15, 1944 4'Shee ts -Sheet 4 Z] r W e/wbw Gas-hf Jag/071g Patented 'Oct. 3, 1944 DEVICE FOR OPENING LIDS HINGED' TO BOXES Gustaf firstrom, Alsten, Sweden, assignor to Arenco Aktiebolag, a joint-stock company of Sweden Application January 15, 1944, Serial No. 518,444 In Germany November 2, 1942 6: Claims.

Thisinvention relates to a device for opening lids hinged to boxes, audit is an object of the invention to provide a simple and compact construction operating continuously or almost continuously on obviating Vibrations and reducing wear of the several'operating members of the device.

With this andother objects in view, which will become apparent as the description proceeds, the invention consists in certain constructions and combinations, which will be hereinafter fully described and then specifically 'set forth in theclaims hereunto appended.

In the drawings:

Fig. l is a plan view of a device embodying the invention;

Fig. 2 is an elevational View, partly in section, taken on the line II-lI of Fig. 1;

Fig. 3 is an elevational view, partly in section and on an enlarged scale, taken on the line III-III of Fig. 1';

Fig. 4 is a horizontal sectional View, taken on the line IVIV of Fig. 3; and

Fig. 5 is an elevational side view in the direction Y VV of Fig. 3.

Referring to the drawings, boxes A having closed lids B drop successively from a chute 30 onto a bar which serves as a conveyor track, upon which they are successively advanced by a pusher 3|, which forms a lateral extension of a lever 32. The lever is pivoted to a pin 33 and actuated by a cam disc 34 secured to a rotary shaft 4|, which is driven by a motor (not shown). The closed boxes are on the bar I successively advanced into a position in front of a pusher or pressing member I8 within a rotary ring 2. The ring 2 is by means of rollers I6 and pins secured to said ring, journalled on an annular rolling race 29, secured to the housing 8. Circumferentially, the ring 2 has a toothed rim 24, which meshes with a pinion secured to a shaft 22. To the shaft 22 there is also secured a sprocket 23, which is driven by a chain 2| running over a sprocket 42 on the driving shaft 4|. A double lever arm is pivoted to a pin 3 on the ring 2. One arm 4 of the lever has a hook 5. The other arm carries a roller 6, which is held in yielding engagement with an annular cam disc I, which is substantially concentric to the ring 2 and secured to the frame 8. For that purpose, a spring 9 resting against a lateral projection 21 on a ring |4 secured to the pins |5 presses against the lever arm 4. A bracket II is secured to the bar and carries a double lever secured thereto. The one arm l2 of said double lever has a roller 35, which is held in engagement with an internal, curved guide on the ring M by means of a tension spring IS on the lower end of which is secured apin projecting laterally from the frame 8. The other arm ll of said lever is provided with the pressing bar l8 extending in the direction of the bar The guide ring I4 is by means of the pins |5 secured to the ring 2, so that it revolves together with the latter and actuates the double lever 2, I! to periodically move the pressing bar |8 inwards against a box A positioned within the ring 2. The bar l8 has a recess I9 for the hook 5 moving therethrough when travelling in its circular path around the bar and box A supported by the latter. A yielding abutment 26 secured interiorly to the ring 29 serves to catch and retain the opened box lid B.

In operation, the boxes A are successively and stepwise moved into position in front of the guide and pressing bar l8, which is then moved inwards into engagement with the front Wall E of the box beneath the front wall D of the lid B of the box. Thereby the box is forced against a shoulder 40 on the bar and adjusted into a correct position on said bar, so that the hinge C of the lid B coincides with the centre, 1. e. the rotary axis of the ring 2. Furthermore, the wall E of the box is impressed slightly, so that it separates from the wall D of the lid B, whereby the operation of the hook 5 is facilitated. On each revolution of the ring 2 one box is moved into position and opened and replaced by a succeeding box to be opened. The hook 5 travelling in a circular path around the box is by the annular cam disc I allowed to move inwards under the influence of the spring 9 immediately before it passes through the recess l9 of the pressing bar I8, so that it will catch the edge of the front wall D of the lid B and on moving in the direction of the arrow F open the latter on turning same about the hinge C into the open position, as shown in dash and dot lines (Fig. 1), whereby the lid B is caught by the yielding latch member 26. When the lid B is being opened the pressing bar l8 retains the box by pressing same against the shoulder 40 of the bar Thereafter the bar I8 is retracted and the opened box is pushed away through the ring 2 upon the bar by through the ring 2 they may be fed continuously on the bar I or other conveyor means, so that they are still moving forwards when the lid is being opened. In such case, the pressing bar 18 is conveniently replaced by one or several rollers, so as to obviate frictional resistance. Due to its compact and simple. construction the device can easily be mounted as a unit on a machine for making boxes and/or filling them.

I claim:

1. In a device for opening lids hinged to boxes, means for conveying the boxes, a lid opening member, and means for moving said opening member in a closed circular path around the path of travel of the boxes to catch the front edge of the lids and open said lids in transit.

2. In a device for opening lids hinged to boxes, a lid opening member, means for moving said opening member in a closed circular path to catch the lids and open said lids in transit, and means for advancing the boxes through said path on maintaining the hinged edge of the lids substantially in the centre of said closed circular path of said member.

3. In a device for opening lids hinged to boxes,

means for conveying the boxes, a lid opening member, means for moving said opening member in a closed circular path around the path of travel of the boxes, and a cam operable in said circular path to cause said opening member move inwards and catch the front edge of the lids and open said lids in transit.

4.111 a device for opening lids hinged to boxes,

means for conveying the boxes, a pressing member, a lid opening member, means for moving said opening member in a circular path around the path of travel of the boxes to catch the front edge of the lids and open the lids in transit, and

means for moving said pressing member against the box wall located the lids before said front edge of the lids is caught by said opening member.

5. In a device for opening lids hinged to boxes, a frame, an annular carrier member rotary journalled in said frame, a, lidopening member movably mountedon said carrier member, means for moving the boxes through said annular carrier member, means for rotating said carrier member to move said opening member in a closed circular path around the path of travel of the boxes, an annular guide member positioned substantially concentrically to said annular carrier member and adapted to cause said lid opening to periodically move inwards to catch the front edge of the lids of the boxes and open said lids in transit and thereafter to cause said opening member to be retracted and release said edge of the lids.

6. In a device for opening lids hinged to boxes, a frame, an annular carrier member rotary journalled in said frame, a lid opening member movably mounted on said carrier member, means for moving the boxes through said annular car rier member, means for rotating said carrier member to move said opening member in a closed circular path around the path of travel .of the boxes, a guide'member positioned in said circular path of said opening member to cause said opening member to move inwards to catch the front edge of the lids of the boxes and open said boxes in transit, and a pressing member, said annularcarrier member having a curved guide adapted to periodically move said pressing'member against the wall of the box located beneath said edge of the lids before said edge of the lids is caught by said opening member. 7

' GUSTAF oRsTRoM.

beneath said front edge of 

